During the term, while the experiment is running, lab leaders should:

• From time to time, monitor the quality of performance of the demonstrators and markers. Ensure that they are punctual in attending at the start of the lab, answer students’ questions correctly, and give their full attention to the lab at all times.
• Respond to any Fast Feedback messages received (see 4. Lab Feedback below).
• Respond to requests from students to rearrange their coursework, which may be permitted where there is good cause (summarised in Guidelines for Rearranging Coursework). You may delegate this task to a senior technician. Where this is approved you will be notified by the teaching office.
• Notify  the Teaching and Examinations Coordinator of any changes that are made to the original demonstrating and marking duties. If a demonstrator has to miss a session, you should make appropriate arrangements for a substitute (where necessary), and inform the Teaching Office of your plan.
• Check that markers keep a look out for students that are cheating by copying laboratory reports from other students. If cheating is suspected, the relevant lab work should be confiscated and the matter referred to the relevant member of staff in charge of Part IA or IB coursework.
• Ensure that an appropriate record of marks is kept (for Part I labs, this is usually done by a senior laboratory technician).  The lab leader is responsible for ensuring the system works efficiently and fairly.
• Make arrangements for all unestablished to claim their pay at the end of the term.